/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 * @file    STM32/i2s_lld.h
 * @brief   I2S Driver subsystem low level driver header template.
 *
 * @addtogroup I2S
 * @{
 */

#ifndef _I2S_LLD_H_
#define _I2S_LLD_H_

#if HAL_USE_I2S || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver constants.                                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Driver pre-compile time settings.                                         */
/*===========================================================================*/

/**
 * @name    Configuration options
 * @{
 */
/**
 * @brief   I2S2 driver enable switch.
 * @details If set to @p TRUE the support for I2S2 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_I2S_USE_I2S2) || defined(__DOXYGEN__)
#define STM32_I2S_USE_I2S2                  FALSE
#endif

/**
 * @brief   I2S3 driver enable switch.
 * @details If set to @p TRUE the support for I2S3 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_I2S_USE_I2S3) || defined(__DOXYGEN__)
#define STM32_I2S_USE_I2S3                  FALSE
#endif

/**
 * @brief   I2S2 interrupt priority level setting.
 */
#if !defined(STM32_I2S_I2S2_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_I2S_I2S2_IRQ_PRIORITY         10
#endif

/**
 * @brief   I2S3 interrupt priority level setting.
 */
#if !defined(STM32_I2S_I2S3_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_I2S_I2S3_IRQ_PRIORITY         10
#endif

/**
 * @brief   I2S2 DMA priority (0..3|lowest..highest).
 */
#if !defined(STM32_I2S_I2S2_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_I2S_I2S2_DMA_PRIORITY         1
#endif

/**
 * @brief   I2S3 DMA priority (0..3|lowest..highest).
 */
#if !defined(STM32_I2S_I2S2_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_I2S_I2S2_DMA_PRIORITY         1
#endif

/**
 * @brief   I2S DMA error hook.
 */
#if !defined(STM32_I2S_DMA_ERROR_HOOK) || defined(__DOXYGEN__)
#define STM32_I2S_DMA_ERROR_HOOK(i2sp)      chSysHalt()
#endif

#if STM32_ADVANCED_DMA || defined(__DOXYGEN__)

/**
 * @brief   DMA stream used for I2S2 RX operations.
 * @note    This option is only available on platforms with enhanced DMA.
 */
#if !defined(STM32_I2S_I2S2_RX_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_I2S_I2S2_RX_DMA_STREAM        STM32_DMA_STREAM_ID(2, 0)
#endif

/**
 * @brief   DMA stream used for I2S2 TX operations.
 * @note    This option is only available on platforms with enhanced DMA.
 */
#if !defined(STM32_I2S_I2S2_TX_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_I2S_I2S2_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 4)
#endif

/**
 * @brief   DMA stream used for I2S3 RX operations.
 * @note    This option is only available on platforms with enhanced DMA.
 */
#if !defined(STM32_I2S_I2S3_RX_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_I2S_I2S3_RX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 0)
#endif

/**
 * @brief   DMA stream used for I2S3 TX operations.
 * @note    This option is only available on platforms with enhanced DMA.
 */
#if !defined(STM32_I2S_I2S3_TX_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_I2S_I2S3_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 7)
#endif

#else /* !STM32_ADVANCED_DMA */

/* Fixed streams for platforms using the old DMA peripheral, the values are
   valid for both STM32F1xx and STM32L1xx.*/
#define STM32_I2S_I2S2_RX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 4)
#define STM32_I2S_I2S2_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 5)
#define STM32_I2S_I2S3_RX_DMA_STREAM        STM32_DMA_STREAM_ID(2, 1)
#define STM32_I2S_I2S3_TX_DMA_STREAM        STM32_DMA_STREAM_ID(2, 2)

#endif /* !STM32_ADVANCED_DMA */
/** @} */

/*===========================================================================*/
/* Derived constants and error checks.                                       */
/*===========================================================================*/

#if STM32_I2S_USE_I2S2 && !STM32_HAS_SPI2
#error "SPI2 not present in the selected device"
#endif

#if STM32_I2S_USE_I2S3 && !STM32_HAS_SPI3
#error "SPI3 not present in the selected device"
#endif

#if !STM32_I2S_USE_I2S2 && !STM32_I2S_USE_I2S3
#error "I2S driver activated but no I2S peripheral assigned"
#endif

#if STM32_I2S_USE_I2S2 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_I2S_I2S2_RX_DMA_STREAM, STM32_SPI2_RX_DMA_MSK)
#error "invalid DMA stream associated to I2S2 RX"
#endif

#if STM32_I2S_USE_I2S2 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_I2S_I2S2_TX_DMA_STREAM, STM32_SPI2_TX_DMA_MSK)
#error "invalid DMA stream associated to I2S2 TX"
#endif

#if STM32_I2S_USE_I2S3 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_I2S_I2S3_RX_DMA_STREAM, STM32_SPI3_RX_DMA_MSK)
#error "invalid DMA stream associated to I2S3 RX"
#endif

#if STM32_I2S_USE_I2S3 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_I2S_I2S3_TX_DMA_STREAM, STM32_SPI3_TX_DMA_MSK)
#error "invalid DMA stream associated to I2S3 TX"
#endif

#if !defined(STM32_DMA_REQUIRED)
#define STM32_DMA_REQUIRED
#endif

/*===========================================================================*/
/* Driver data structures and types.                                         */
/*===========================================================================*/

/**
 * @brief   I2S mode type.
 */
typedef uint32_t i2smode_t;

/**
 * @brief   Type of a structure representing an I2S driver.
 */
typedef struct I2SDriver I2SDriver;

/**
 * @brief   I2S notification callback type.
 *
 * @param[in] i2sp      pointer to the @p I2SDriver object
 * @param[in] buffer    pointer to the buffer
 * @param[in] n         number of sample positions starting from @p buffer
 */
typedef void (*i2scallback_t)(I2SDriver *i2sp, void *buffer, size_t n);

/**
 * @brief   Driver configuration structure.
 * @note    It could be empty on some architectures.
 */
typedef struct {
  /**
   * @brief   I2S mode selection.
   */
  i2smode_t                 mode;
  /**
   * @brief   Transmission buffer pointer.
   */
  const void                *tx_buffer;
  /**
   * @brief   Transmission buffer size in number of samples.
   */
  size_t                    tx_size;
  /**
   * @brief   Callback function associated to the transmission or @p NULL.
   */
  i2scallback_t             tx_cb;
  /**
   * @brief   Receive buffer pointer.
   */
  void                      *rx_buffer;
  /**
   * @brief   Receive buffer size in number of samples.
   */
  size_t                    rx_size;
  /**
   * @brief   Callback function associated to the reception or @p NULL.
   */
  i2scallback_t             rx_cb;;
  /* End of the mandatory fields.*/
  /**
   * @brief   Configuration of the I2SCFGR register.
   * @details See the STM32 reference manual, this register is used for
   *          the I2S configuration, the following bits must not be
   *          specified because handled directly by the driver:
   *          - I2SMOD
   *          - I2SE
   *          - I2SCFG
   *          .
   */
  int16_t                   i2scfgr;
  /**
   * @brief   Configuration of the I2SPR register.
   * @details See the STM32 reference manual, this register is used for
   *          the I2S clock setup.
   */
  int16_t                   i2spr;
} I2SConfig;

/**
 * @brief   Structure representing an I2S driver.
 */
struct I2SDriver {
  /**
   * @brief   Driver state.
   */
  i2sstate_t                state;
  /**
   * @brief   Current configuration data.
   */
  const I2SConfig           *config;
  /* End of the mandatory fields.*/
  /**
   * @brief   Pointer to the SPIx registers block.
   */
  SPI_TypeDef               *spi;
  /**
   * @brief   DMA stream.
   */
  const stm32_dma_stream_t  *dma;
  /**
   * @brief   DMA mode bit mask.
   */
  uint32_t                  dmamode;
};

/*===========================================================================*/
/* Driver macros.                                                            */
/*===========================================================================*/

/*===========================================================================*/
/* External declarations.                                                    */
/*===========================================================================*/

#if STM32_I2S_USE_I2S2 && !defined(__DOXYGEN__)
extern I2SDriver I2SD2;
#endif

#if STM32_I2S_USE_I2S3 && !defined(__DOXYGEN__)
extern I2SDriver I2SD3;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  void i2s_lld_init(void);
  void i2s_lld_start(I2SDriver *i2sp);
  void i2s_lld_stop(I2SDriver *i2sp);
  void i2s_lld_start_exchange(I2SDriver *i2sp);
  void i2s_lld_start_exchange_continuous(I2SDriver *i2sp);
  void i2s_lld_stop_exchange(I2SDriver *i2sp);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_I2S */

#endif /* _I2S_LLD_H_ */

/** @} */
